Now, Attorney General Brad Schimel has filed an appeal the judge’s decision in Wisconsin federal court, arguing that Brendan's confession was not, in fact, coerced.

In a statement, he said: "We believe the magistrate judge's decision that Brendan Dassey's confession was coerced by investigators, and that no reasonable court could have concluded otherwise, is wrong on the facts and wrong on the law.

"Two state courts carefully examined the evidence and properly concluded that Brendan Dassey's confession to sexually assaulting and murdering Teresa Halbach with his uncle, Steven Avery, was voluntary, and the investigators did not use constitutionally impermissible tactics."

With this appeal Dassey will remain in prison pending the outcome of a new trial.

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Many of the doubts about his conviction stem from the way he was interrogated, which featured on Making a Murderer.

Then 16, he was interrogated several times over two days - at his school, the police station and at the family's lodge.

Brendan didn't have a lawyer, parent or responsible adult with him, and a technique developed to put pressure on suspects was used.

The teenager eventually confessed to being a co-conspirator in the rape and murder, but he later recanted that. He claimed detectives kept asking him the same thing until he said what they wanted to hear.

His legal team have pointed out that there isn't any DNA evidence putting him at the scene.

It's also been argued that his description of the murder couldn't be what happened as it would have involved Teresa's blood being spilt, and none was found where Brendan claimed it took place.

Part of the evidence against him came from his cousin Kayla, who told a school counsellor Steven had asked one of her cousins to help move a body.

At Brendan's trial, Kayla said she'd lied.

This was all included in the documentary, which sparked questions about coercion.

Also featured was footage of Brendan's first lawyer Mike O'Kelly, who was eventually removed from the case on the request of Brendan's mother Barb.

Some of Mike's techniques were called into question by the documentary, including his request that Brendan sign a form stating he was sorry for his actions. This can be seen as admission of guilt in court.